The target detection accuracy of a radar apparatus is improved. The radar apparatus includes transmission circuitry, which, in operation, transmits a transmission signal using a plurality of transmit antennas, and reception circuitry, which, in operation, receives using a plurality of receive antennas a reflected wave signal that is the transmission signal reflected by an object, in which the plurality of transmit antennas include at least one first transmit antenna and a plurality of second transmit antennas, and, in a first direction, an absolute value of a difference between, on one hand, a spacing between the at least one first transmit antenna and a phase center of those of the plurality of second transmit antennas which are used for beam synthesis, and, on another hand, a spacing between adjacent receive antennas of the plurality of receive antennas is a defined value based on a wavelength of the plurality of transmission signals.

In a radar device, a hypothesis selector selects one of first to third hypotheses based on velocity-accuracy posterior distributions after a preset number of distribution calculations. The first hypothesis assumes that an observed velocity of an object is an aliased relative velocity when the relative velocity is higher than an upper limit of an observable velocity range. The second hypothesis assumes that the observed velocity is an unaliased relative velocity. The third hypothesis assumes that the observed velocity is an aliased relative velocity in a case where the relative velocity is below a lower limit of the observable velocity range. The velocity-accuracy posterior distributions are respectively calculated for the first to third hypotheses from velocity-accuracy prior distributions and a detection result of observed velocities for the preset number of distribution calculations.

A method of radar ranging comprises transmitting a digitally-modulated signal comprising successively in time, for each sequence in a plurality N of sequences, a plurality M+1 of repeats of said sequence, wherein each said sequence consists of a plurality L.sub.c of digitally-modulated chips, wherein at least one sequence in the plurality of sequences is different from another sequence in said plurality of sequences; receiving a version of the digitally-modulated signal reflected scattered by one or more physical targets; for each sequence in the plurality of sequences, performing a preliminary target estimation; and using each said preliminary target estimation for all sequences in the plurality of sequences, performing a final target estimation.

A MIMO radar apparatus using correlated motion decomposed from reflectance data of multiple time frames to enhance discriminatory capacity in imaging. The MIMO radar apparatus includes power saving measures and has application in tracking temporal patterns of respiratory and cardiac activities in addition to recognition of targets within non-stationary environments.

Apparatus and methods are disclosed for determining, at a radar device, range and Doppler velocity based on reduced Doppler-induced radar range sidelobes, including generating code sequence pairs such that a sum of autocorrelations of each code sequence pair has substantially no sidelobes, transmitting a plurality of pulses in an emitted burst, where each pulse of the emitted burst comprises a code sequence pair different from at least one other pulse of the burst such that the autocorrelation sum of the code sequence pairs of the two different pulses has sidelobes, receiving pulses in a reflected burst, each pulse a reflected copy of a corresponding pulse of the emitted burst, generating an autocorrelation sum for each reflected pulse with its corresponding emitted pulse, and determining range and Doppler velocity based on autocorrelation sums, where the sidelobes autocorrelation sums combine incoherently at reduced power.

A transceiver circuit included in a computer system may include multiple antennas, a transmitter circuit and a receiver circuit. The transmitter circuit may store an identifier number and generate multiple numbers using the stored identifier number. The transmitter circuit may also generate a transmit signal that include multiple pulses, where a. given pulse may include multiple chirps encoded with the multiple numbers. The receiver circuit may receive a reflected version of the transmit signal and generate an output signal using the reflected version of the transmit signal.

A radar system including a transmitter configured for installation and use with the radar system and configured to transmit radio signals. The transmitted radio signals are defined by a spreading code. The radar system also includes a receiver configured for installation and use with the radar system and configured to receive radio signals that include transmitted radio signals transmitted by the transmitter and reflected from objects in an environment. The receiver is configured to convert the received radio signals into frequency domain received samples. The receiver is also configured to correlate the frequency domain received samples to detect object distance.

A radar system including a transmitter configured for installation and use with the radar system and configured to transmit radio signals. The transmitted radio signals are defined by a spreading code. The radar system also includes a receiver configured for installation and use with the radar system and configured to receive radio signals that include transmitted radio signals transmitted by the transmitter and reflected from objects in an environment. The receiver is configured to convert the received radio signals into frequency domain received samples. The receiver is also configured to correlate the frequency domain received samples to detect object distance.

Disclosed are techniques for transmitting and receiving a plurality of encoded information bits on a radar signal. In an aspect, a transmitter radar generates a first set of modulated phase-coded symbols to convey the plurality of encoded information bits, generates a second set of modulated phase-coded symbols as reference symbols having a known phase modulation, phase codes a plurality of chirps of the radar signal according to the first and second sets of modulated phase-coded symbols, and transmits the plurality of chirps according to the phase coding. A receiver radar determines a phase difference between the receiver and transmitter radars based on a phase of the plurality of chirps, equalizes the phase based on the determined phase difference, determines a phase code of the first set of symbols based on the equalized phase, and decodes the encoded information bits based on the phase code of the first set of symbols.

A bi-static integrated pulse radar in the millimeter wave band based on a digitally modulated transmitter and an analog processing receiver. The front-end correlator uses a sampler to compress the sensing data, enabling a low-speed and energy efficient digital backend while delivering a high range resolution. The radar may be implemented as a system on chip (SoC) with a total power consumption of a few hundred milliwatts (mW), a surface area of less than four mm.sup.2 with less than ten percent of the total power corresponding to the analog baseband and digital back-end. The system performance indicates the measured distance from the correlator output has an RMS error of about ten centimeters (cm) and the integral non-linearity is less than ten cm across the entire target range, demonstrating the superior range resolution with superior energy efficiency.